// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_FETCHERS_MULTI_RESOLUTION_IMAGE_RESOURCE_FETCHER_H_
#define CONTENT_RENDERER_FETCHERS_MULTI_RESOLUTION_IMAGE_RESOURCE_FETCHER_H_

#include <memory>
#include <string>
#include <vector>

#include "base/callback.h"
#include "base/macros.h"
#include "third_party/WebKit/public/platform/WebURLRequest.h"
#include "url/gurl.h"

class SkBitmap;

namespace blink {
class WebFrame;
class WebURLResponse;
enum class WebCachePolicy;
}

namespace content {

class AssociatedResourceFetcher;

// A resource fetcher that returns all (differently-sized) frames in
// an image. Useful for favicons.
class MultiResolutionImageResourceFetcher {
public:
    typedef base::Callback<void(MultiResolutionImageResourceFetcher*,
        const std::vector<SkBitmap>&)>
        Callback;

    MultiResolutionImageResourceFetcher(
        const GURL& image_url,
        blink::WebFrame* frame,
        int id,
        blink::WebURLRequest::RequestContext request_context,
        blink::WebCachePolicy cache_policy,
        const Callback& callback);

    virtual ~MultiResolutionImageResourceFetcher();

    // URL of the image we're downloading.
    const GURL& image_url() const { return image_url_; }

    // Unique identifier for the request.
    int id() const { return id_; }

    // HTTP status code upon fetch completion.
    int http_status_code() const { return http_status_code_; }

    // Called when associated RenderFrame is destructed.
    void OnRenderFrameDestruct();

private:
    // ResourceFetcher::Callback. Decodes the image and invokes callback_.
    void OnURLFetchComplete(const blink::WebURLResponse& response,
        const std::string& data);

    Callback callback_;

    // Unique identifier for the request.
    const int id_;

    // HTTP status code upon fetch completion.
    int http_status_code_;

    // URL of the image.
    const GURL image_url_;

    // Does the actual download.
    std::unique_ptr<AssociatedResourceFetcher> fetcher_;

    DISALLOW_COPY_AND_ASSIGN(MultiResolutionImageResourceFetcher);
};

} // namespace content

#endif // CONTENT_RENDERER_FETCHERS_MULTI_RESOLUTION_IMAGE_RESOURCE_FETCHER_H_
